Why do scientists use STP? A. STP has no negative numbers which makes calculations easier. B. Temperature and pressure affect the behavior of gases, scientists need to "standardize" the conditions at which gases are studied. C. Using 500 K and 500 kPa for standard temperature and pressure, conditions are kept constant D. STP is used so that the Celsius temperature can be used in gas law calculations.

1. A student neglected to keep the end of the deliyery tube under the surface of the water displaced os Of your calculations. hydrogen while the collected gas was cooling. What effect will this have on the volume of hydrogen collected? What effect will this have on the calculated mass of magnesium? a balanced chemical equation.

The density of NO gas at 16°C and 1.27 atm is O a. 1.61 g/L. O b. 1.71 g/L. O c. 1.98 g/L. O d. 2.36 g/L. O e. 1.50 g/L.

Which concept best accounts for the fact that gases can escape through a pinhole faster at higher temperatures? Select one: O a. A gas is composed of molecules whose size is much smaller than the distances between them. O b. Gas molecules move randomly--at various speeds and in every possible direction. O c. Except when molecules collide, forces of attraction and repulsion between them are negligible. d. When collision occur, they are elastic. Oe. The average kinetic energy of gas molecules is proportional to the absolute temperature. Frombois III (Log out) G Search or type URL % 5 6 & 7 || ☆ 00- 8 ( ( Finish attempt ...